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Semicarbazide-sensitive amine oxidase in pig heart
T G Dowling1, S Cambi, F Buffoni
1Department of Pharmacology, University of Florence, Italy.
Journal of Neural Transmission. Supplementum
|June 13, 1998
Summary
Pig heart semicarbazide-sensitive amine oxidase (SSAO) was purified and found to be identical to plasma benzylamine oxidase (BAO). This enzyme is crucial for understanding amine metabolism and related cardiovascular functions.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Semicarbazide-sensitive amine oxidase (SSAO) is an enzyme implicated in various physiological processes.
- Understanding the biochemical properties and identity of SSAO is crucial for its functional characterization.
Purpose of the Study:
- To purify and characterize semicarbazide-sensitive amine oxidase (SSAO) from pig heart.
- To compare the purified pig heart SSAO with pig plasma benzylamine oxidase (BAO).
Main Methods:
- Enzyme purification using sequential chromatography (DEAE cellulose, octyl-Sepharose, Con A-Sepharose, hydroxyapatite).
- Western blot analysis using antibodies against pig plasma BAO.
- SDS-PAGE for subunit molecular mass determination.
- Enzyme kinetics assays (Km for benzylamine).
Main Results:
- Purification of pig heart SSAO yielding two indistinguishable activity peaks.
- Western blot confirmed immunological identity with pig plasma BAO.
- Identical subunit molecular mass (97 KDa) for both enzymes.
- Kinetic analysis revealed a Km of 63 μM for benzylamine.
- Enzyme inhibition by semicarbazide and insensitivity to pargyline.
Conclusions:
- Pig heart SSAO is biochemically and immunologically identical to pig plasma BAO.
- The study provides insights into the identity and properties of SSAO, relevant to amine metabolism.
- Findings suggest a potential shared identity or close relationship between SSAO and BAO in pigs.